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diff --git a/indra/newview/llscreenchannel.h b/indra/newview/llscreenchannel.h
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+/** 
+ * @file llscreenchannel.h
+ * @brief Class implements a channel on a screen in which appropriate toasts may appear.
+ *
+ * $LicenseInfo:firstyear=2003&license=viewergpl$
+ * 
+ * Copyright (c) 2003-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLSCREENCHANNEL_H
+#define LL_LLSCREENCHANNEL_H
+
+#include "lltoast.h"
+
+#include <map>
+#include <boost/shared_ptr.hpp>
+
+namespace LLNotificationsUI
+{
+
+typedef enum e_notification_toast_alignment
+{
+	NA_TOP, 
+	NA_CENTRE,
+	NA_BOTTOM,
+} EToastAlignment;
+
+
+/**
+ * Screen channel manages toasts visibility and positioning on the screen.
+ */
+class LLScreenChannel : public LLUICtrl
+{
+	friend class LLChannelManager;
+public:
+	LLScreenChannel();
+	virtual ~LLScreenChannel();
+
+	void		reshape(S32 width, S32 height, BOOL called_from_parent = TRUE);
+
+	LLToast*	addToast(LLUUID id, LLPanel* panel, bool is_not_tip = true);
+	void		init(S32 channel_left, S32 channel_right);
+	
+	void		killToastByNotificationID(LLUUID id);
+	void		modifyToastByNotificationID(LLUUID id, LLPanel* panel);
+	
+	void		setToastAlignment(e_notification_toast_alignment align) {mToastAlignment = align;}
+
+	void		setControlHovering(bool control) { mControlHovering = control; }
+	void		setHovering(bool hovering) { mIsHovering = hovering; }
+
+	void		removeToastsFromChannel();
+	void		hideToastsFromScreen();
+
+	void		setStoreToasts(bool store) { mStoreToasts = store; }
+	void		loadStoredToastsToChannel();
+	
+	void		showToasts();
+
+	S32			getNumberOfHiddenToasts() { return mHiddenToastsNum;}
+	void		setNumberOfHiddenToasts(S32 num) { mHiddenToastsNum = num;}
+
+	static void	setStartUpToastShown() { mWasStartUpToastShown = true; }
+
+	e_notification_toast_alignment getToastAlignment() {return mToastAlignment;}
+
+	void		setOverflowFormatString ( std::string str)  { mOverflowFormatString = str; }
+
+private:
+	struct ToastElem
+	{
+		LLUUID		id;
+		LLToast*	toast;
+		ToastElem(LLUUID lluuid, LLPanel* panel) : id(lluuid)
+		{
+			toast = new LLToast(panel);
+		}
+
+		ToastElem(const ToastElem& toast_elem)
+		{
+			id = toast_elem.id;
+			toast = toast_elem.toast;
+		}
+
+		bool operator == (const LLUUID &id_op) const
+		{
+			return (id == id_op);
+		}
+
+		bool operator == (LLPanel* panel_op) const
+		{
+			return (toast == panel_op);
+		}
+	};
+
+	void	onToastHover(LLToast* toast, bool mouse_enter);
+
+	void	onToastFade(LLToast* toast);
+	void	storeToast(ToastElem& toast_elem);
+	
+	void	showToastsBottom();
+	void	showToastsCentre();
+	void	showToastsTop();
+	
+	void	createOverflowToast(S32 bottom, F32 timer = 0);
+	void	onOverflowToastHide();
+
+	static bool	mWasStartUpToastShown;
+	bool		mControlHovering;
+	bool		mIsHovering;
+	bool		mStoreToasts;
+	bool		mOverflowToastHidden;
+	S32			mHiddenToastsNum;
+	LLToast*	mUnreadToastsPanel;
+	std::vector<ToastElem>	mToastList;
+	std::vector<ToastElem>	mStoredToastList;
+	e_notification_toast_alignment	mToastAlignment;
+	std::map<LLToast*, bool>	mToastEventStack;
+
+	std::string mOverflowFormatString;
+};
+
+}
+#endif